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Preparation method and application of AgNPs (at) SASP substrate material

A base material and seed technology, applied in the field of nanomaterials, can solve the problems of expensive preparation, affecting the stability and reproducibility of SERS test results, and surface uniformity, and achieve the effect of ensuring food safety.

Active Publication Date: 2022-05-27
HENAN AGRICULTURAL UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Rough metal surface materials in solid substrates have better stability in use and storage, but roughened surfaces often have uniformity problems, which directly affect the stability and reproducibility of SERS detection results
Highly ordered substrates by photolithography can be very uniform, but expensive to prepare

Method used

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  • Preparation method and application of AgNPs (at) SASP substrate material
  • Preparation method and application of AgNPs (at) SASP substrate material
  • Preparation method and application of AgNPs (at) SASP substrate material

Examples

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Effect test

Embodiment 1

[0038] The preparation method of the AgNPs@SASP base material of the present embodiment is as follows:

[0039] (1) Preparation of AgNPs by seed-mediated secondary growth method

[0040] a. Add 75ml of ultrapure water to 20ml of trisodium citrate with a mass fraction of 1%, heat in a round bottom flask for 15min at 70°C, and add 1.7ml of AgNO with a mass fraction of 1% to the mixture 3 solution. Then quickly add 2ml of 0.1% NaBH 4 The solution reaction solution was stirred at 70°C and then cooled to room temperature, and water was added to a volume of 100 ml to obtain the starting seed solution of AgNPs.

[0041] b. Add 75ml of water and 2ml of 1% trisodium citrate solution into a 100mL round-bottomed flask, and then add 10mL of the prepared AgNPs starting seed solution and 1.7ml of 1% AgNO at a constant speed. 3 solution, and kept stirring the mixture vigorously for 1h, this step was repeated twice (that is, after cooling to room temperature, 2ml of 1% trisodium citrate aqu...

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Abstract

The invention discloses a preparation method and application of an AgNPs (at) SASP substrate material, cyclohexane is taken as an organic phase, ethanol is taken as an inducer, and self-assembly is carried out by utilizing interfacial tension of an organic / water interface, so that nanoparticles are arranged in a single layer. A low-dielectric solvent is added to serve as an inducer to reduce the charge density result on the nanoparticles, Van der Waals force and coulomb repulsive force are reduced, so that the nanoparticles have the tendency of reassembling on an organic / water interface, a new balance is formed, and an SERS platform of a two-dimensional AgNPs array is formed. Different food-borne pathogenic bacteria spores are subjected to SERS (Surface Enhanced Raman Scattering) detection and peak position attribution analysis, and qualitative analysis is performed through a multivariate statistics method, so that rapid identification of spore bacteria is realized.

Description

technical field [0001] The invention belongs to the technical field of nanomaterials, and in particular relates to a preparation method and application of an AgNPs@SASP base material. Background technique [0002] Foodborne pathogens are pathogenic bacteria that can cause food poisoning or food-borne pathogens, and they cause gastrointestinal inflammation in humans, such as food poisoning, nausea and diarrhea. Foodborne illnesses caused by foodborne pathogens kill approximately 20 million people worldwide each year. Food-borne pathogens are one of the important causes of food safety problems. Among them, food-borne spores, such as Clostridium perfringens, Bacillus subtilis, and Bacillus cereus, can produce dormant bodies under environmental stress. -Spores, which are extremely resistant to radiation, heat, drying, extreme pH, hydrostatic pressure, and some toxic chemicals. Once the conditions are suitable, the spores can germinate and produce toxins, which will not only le...

Claims

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Application Information

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IPC IPC(8): B22F9/24B22F1/054C23C26/00G01N21/65B82Y15/00B82Y30/00
CPCB22F9/24C23C26/00G01N21/658B82Y15/00B82Y30/00Y02A50/30C30B19/12
Inventor 李苗云朱瑶迪刘惟佳赵莉君王娜林建涵马阳阳梁栋赵改名孙灵霞柳艳霞刘世杰田家齐
Owner HENAN AGRICULTURAL UNIVERSITY
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